Down’s syndrome screening in China is a free screening program, but pregnant women need to comply with the relevant policies, consult the maternity hospital for details. Down’s syndrome screening is performed between 15 and 20+6 weeks of gestation by taking blood from a pregnant woman’s vein and testing the concentration of free estriol, chorionic gonadotropin and alpha-fetoprotein in the blood to calculate the risk of Down’s syndrome in the fetus through a certain formula. Since Down’s syndrome is a chromosomal disorder, the child is born with low intelligence and life skills, multiple organ and body malformations, and there is no good treatment. If the risk of Down’s syndrome is high, further non-invasive prenatal DNA or amniocentesis will be required to confirm the diagnosis, and it is best to induce labor if the child is diagnosed with Down’s syndrome.